GPS01
NMEA Messages
The serial interface protocol is based on the National Marine Electronics Association’s NMEA 0183 ASCII
interface specification. This standard is fully define in “NMEA 0183, Version 3.01” The standard may be
obtained from NMEA, www.nmea.org
GGA - Global Positioning System Fix Data
Time, position and fix related data for a GPS receiver.
Structure:
$GPGGA,hhmmss.sss,ddmm.mmmm,a,dddmm.mmmm,a,x,xx,x.x,x.x,M,,,,xxxx*hh<CR><LF>
1
2
3
4
5 6 7 8
9
10 11
Example:
$GPGGA,111636.932,2447.0949,N,12100.5223,E,1,11,0.8,118.2,M,,,,0000*02<CR><LF>
Field Name
Example
Description
1
UTC Time
111636.932
UTC of position in hhmmss.sss format, (000000.000 ~
235959.999)
2
Latitude
2447.0949
Latitude in ddmm.mmmm format
Leading zeros transmitted
3
4
N/S Indicator
Longitude
N
Latitude hemisphere indicator, ‘N’ = North, ‘S’ = South
Longitude in dddmm.mmmm format
Leading zeros transmitted
12100.5223
5
6
E/W Indicator
GPS quality
indicator
E
1
Longitude hemisphere indicator, 'E' = East, 'W' = West
GPS quality indicator
0: position fix unavailable
1: valid position fix, SPS mode
2: valid position fix, differential GPS mode
3: GPS PPS Mode, fix valid
4: Real Time Kinematic. System used in RTK mode with
fixed integers
5: Float RTK. Satellite system used in RTK mode. Floating
integers
6: Estimated (dead reckoning) Mode
7: Manual Input Mode
8: Simulator Mode
7
8
9
10
Satellites Used
HDOP
Altitude
11
0.8
108.2
0000
Number of satellites in use, (00 ~ 12)
Horizontal dilution of precision, (00.0 ~ 99.9)
mean sea level (geoid), (-9999.9 ~ 17999.9)
Differential reference station ID, 0000 ~ 1023
NULL when DGPS not used
DGPS Station ID
11
Checksum
02
Note: The checksum field starts with a ‘*’ and consists of 2 characters representing a hex number. The
checksum is the exclusive OR of all characters between ‘$’ and ‘*’.
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